Mine-gate lock.



Q. GAVAZZI.

MINE GATE LOCK.

APPLICATION man MAR. 31, 1915.

Patented June 27, 1916.

333 30 June 14101 UNTTE i;

QUINTO GAVAZZI, OF 0L1) FORGE, PENNSYLVANIA.

MINE-GATE LOCK.

Application filed March 31, 1915.

To all whom it may concern Be it known that I, QUINTO GAvAzzI, a citizenof the United States of America, and resident of Old Forge, in thecounty of Lackawanna and State of Pennsylvania, have invented certainnew and useful Improvements in Mine-Gate Locks, of which the followingis a specification.

This invention relates to mine cars and particularly to safety devicesfor the doors thereof, the said invention having for its object theprovision of novel means for looking the door and retaining it lockeduntil such time as the car is in position at the landing for receivingor discharging a load,

novel means being provided whereby the car or device carried therebyactuates a lock or latch releasing device so that the latch is free tobe moved out of engagement with its interlocking member only when thecar is opposite the said landing or door.

A still further object of this invention is to provide novel meansforreturning the latch guard to its normal operative position when thecar has been moved out of engagement with the guard operating means.

With the foregoing and other objects in view, the invention consists inthe details of construction, and in the arrangement and combination ofparts to be hereinafter more fully set forth and claimed.

In describing the invention in detail, reference will be had to theaccompanying drawings forming part of this specification wherein likecharacters denote corresponding parts in the several views, and inwhich- Figure 1 illustrates a fragment of an elevator shaft showing thedoor in section and the locking mechanism associated therewith; Fig. 2illustrates a horizontal sectional view thereof showing a fragment ofthe car; Fig. 3 illustrates a perspective view of the latch; Fig. 4illustrates a side elevation thereof with the latch operating lever insection; Fig. 5 illustrates a plan view of the latch and latch engagingmember; and Fig. 6 illustrates a plan view of the latch engaging member.

In these drawings 7 denotes a guide rail usually employed in elevators,8 a channel iron constituting a part of an elevator car which operatesin conjunction with the guide rail, although the means for guiding thecar and the means coacting with the said guiding means may be of anyappropriate Specification of Letters Patent.

Patented June 27, 1916.

Serial No. 18,339.

construction and I do not wish to be limited wlth respect to theconstruction of the elevator, as it will be apparent from an inspectionof the invention that the guard for the door latch may be actuated fromany part of the car, so long as the car is provided with a trlppingdevice, a type of which is shown herein and is identified by thereference numeral 9. In the present embodiment of this feature of theinvention, a wheel is employed which is carried by the car and the saidwheel is adapted to operate toggle levers 10 for forcing them inwardly;the said toggle levers being operated in an opposite direction by aspring 11 connected to a pivot 12 of the toggles, the opposite end ofthe spring being anchored to an arm 13 extending from the plate 1 1, thesaid plate having a stud 15 on which the lower ends of the toggle loversare pivoted. The plate is secured to the well casing 16 in anyappropriate way.

As a means for limiting the movement of the toggles under the influenceof the spring, the said spring is housed in a tube 17 with a flared end18 against which the toggles abut and the said tube is interposedbetween the toggles and the arm as shown in Fig. 1. A bar 19 ispivotally connected to the ends of the toggles remote from the pivot onthe plate and the said bar is pivotally connected to a bell crank 20,which bell crank is mounted on a pivot 21. The bell crank 20 operates athrust bar and the thrust bar in turn is pivotally connected to a guard23, which guard is slidable on a plate 24: secured to the inner wall ofthe well casing. The plate 2 1 has a downwardly extending spring tongue25 with an aperture 26 and the said plate 24: has a guide 27 throughwhich the guard is slidable.

The door 28 of the well casing has a housing 29 secured to it and thesaid housing carries a pivot 30 on which the latch 31 is mounted, therebeing spacing collars 32 on the pivot 80 between the latch and the sidesof the housing. Furthermore, the said housing has a pin 33 extendingtherethrough which constitutes a support for the latch. From the factthat the door carries a hous ing and latch, the said latch rides overthe curved surface of the tongue 25 when the door is closed and the nose34 of the latch will drop into the aperture 26 of the tongue, thuseffecting an interlocking engagement which will prevent opening of thedoor until the latch is elevated clear of the tongue. To preventaccidental movement of the latch after it has engaged the tongue of theplate, the guard 23 is caused to overlie the latch and engage a lug 35which is formed thereon to maintain the interlocked relation of thelatch and tongue. In order to disengage the latch and tongue after theguard is removed from the latch, a lever 36 is pivoted to the door andone end thereof projects through an aperture 37 in the housing and underthe latch so that when the upper end of the lever is operated, the latchwill be elevated from engagement with the tongue and the door may swingopen.

From what has been said of the guard operating mechanism, it is apparentthat the latches of all the doors of a mine shaft are guarded at alltimes except when the car is stopped at a landing where it is unguarded,and furthermore, that the car must be in a certain position withrelation to the landing before the latch is unguarded. The relation ofparts can, therefore, be maintained so that the operator of a mine carcannot open the door when the car is above or below the landing, or whenthe car is in motion. The tongue is resilient and the nose of the latchhas a curved surface 38 constituting a cam which rides over the tongue,thus elevating the latch so that it will fall into the aperture or slotof the tongue.

and adapted to interlock with the tongue of the plate, a guard adaptedto slide into engagement with the latch and retain the same inengagement with the tongue, a toggle, means for connecting the toggle tooperate the guard, and means carried by a mine car for operating thetoggle.

2. In a mine door look, a plate having a depending apertured tonguestationary with relation to the door of a mine cage, a housing carriedby the door, a latch member pivotally supported by the housing, a guardmember carried by the plate, a guard operating in the guard member,toggle levers associated with the guard, means for normally holding theguard into engagement with the latch member, and means carried by a minecage for engaging the toggle and moving the guard out of engagement withthe latch.

In testimony whereof, I aflix my signature in the presence of twowitnesses.

QUIN'ro GAVAZZI.

lVitnesses SAMUEL BRoDHnAn, FRANK RosATI.

copies of this patent may he obtained 10: five cents each, by addressi gthe "Commissioner o1! getentg. Washington. D. 0.,"

